Cement-kiln.



Nol 850,750.

l W. H}HARDING.

CEMENT KILN.

APPLICATION FILED TBB. 1. 1907.

PATENTED APR. 16, 1907.

` lsv/Gefen 55 .in the bottom of the pit, so Ias to convey ma UNITEDsTATEs PATENT' OFFICE..

WILLIAM PI. PIARDING, on PHILADELPHIA, PENNSYLVANIA.

CEMENT-Kim.

Specieaton of Letters Patent. I

' Patented April 1e, 1907.

Applicatie; tied Pantry 1, 1907. serai No. 355.223.

To all whom it vmay concerne.-

Be it known that LWILLIAM HARDING, a citizen of the United.States`,`residing in Philadelphiffi,v Pennsylvania, have inventedcertain improvements in Cement-Kilns, et

i which the following is a specification whichl there is a rotating.cylindricalshelL arear end ofthe kiln structure illustrating my Myinvention relates to certain improvements in cement-kilns oftherotarytype in driving ofi a certain portion oi' the carbonio-'These'- objects, Ik ,attain in the following- '.manner, reference beingVhad to the accomlpanying drawings, in Whiche a c s A 4 5 Figure l 1s avertical sectional vleW of the invention ;r and Fig. 2 is a section onthe line 2 2, fFig. 1.-

A is the rear eand-of'a'rotary kiln, supported l onrollers a in theusual manner.

B is the rear hood or combustion-chamber, fand Bis the stack.

D is the` bin for the-cement material. l

shown as a screw conveyer, 'theblades of which are arranged ri ht andleft, so as to feed in both directions rom a centralpoint.

E is a series of tubes which extend from the conveyer D into'thecombusti ori-chamber, preferably' to a point belowv the -openingo ofthe rotary kiln A. These tubesare preferablvprowided with valves e tolregulate the I flow of material therethrough.

lt will be noticed in referring to thedraw ings that there is aconsiderable s ace between the lower edge of thefrotary ki n A and thebottom of the rear hood or combustioncliamber, sothata large quantit -ofmaterial can be stored within this space; ut it will beA understood thatthis space may be increased by making' a pit under thecombustion-chamber to any depth desired. 'I' referably make the bottomof the pit thus ormed inclined, as at 1r, and place a screwi; conveyer Fa .certain degree.

terial in I an eveny stream therefrom. The shaft' f of. this screwconveyer is geared to any suitable driving mechanism.

At the rear of the combustion-'chamber vB is an endless-chain bucketelevator G, having pockets g, the chain passing around Wheels g'lheconveyer F feeds the materialinto kthe boot g2 of this elevator, andthebuckets ltake up the material and discharge it onto an inclined chuteortube i, which extends through the combustion-chamber B intoy thefeedend of the rotarykiln A. The material maybe `fed by gravity throughthis tube, as shown in the drawings, or a screw conveyor maybe used topositively feed the material through said tube, depending altogetherupon the in clin'ationof the tube. K j

While l `haveshown three vertical tubes E extending from the bin to theit in the bottom of the combustion-cham er, it will be understood thatone orvmore `tubes may be usedand that' other means may be provided.vfor feeding the material to the tubes thanA that shown in the drawingsand that otherv forms 'of 4elevators may be used without de# partingfrom the essential feature of the invention. The operation is asfollows: rlhe material is fed to the bin D and 1from the bin is con!veyedto one ormore of the tubes E, and as these tubes are subjected tothe direct action l of the rcducts of combustion as they pass fromt eend of the rotary kiln'they become I vhighly heated', and consequentlythe mate- D is a conveyor, 'iny the present instance,-

rial passing'through the tubes is heated to mulates in the bottom of thecombustionlchamber B it is heated to a furtherdegree Vby the action ofthe waste roducts of combustion playing inthe com ustion-chamber.Consequently a certain proportion ofthe carbonic-acid gas is driven 0Sthe cement mate- As the material accu-- rial before it enters therotarykiln. lThis for its introduction into the rotary kiln, .and

also a certain proportion of the carbonc-acid gas is drivenoff beto .ethe material enters the rotary kiln y l 1'.- The combination of a kiln,a combusf tion-chamber-,atthe re'ar of the kiln havingy a space belowthe'mouth of the'kiln and dut? of the path of theiproducts ofcombustion, means for -supplying'material to the space,

\and means for removing Ithe material from and out of the path of theproducts of combustion, means for supplying material to the space acrossthe path of the products of combustion, and means tfor removingthematerial from the storagefspace and introducing it into the kiln,substantially as described.

8. The combination of a kilnfa combus-l tion-chamber at the rear of thekiln having a storage-space below the mouth of the kiln! and out ofthepath of the products of combu'stion,`one or more tubesextending throughf 'the lupper portion 'of the .combustion-charn- `ber in thelpath. ofthe prpducts of combustion, means for feeding material throu h thetubes, said tubes discharging materia linto the storage-spacein thecombustion-chamber, and means for removing material from thestoragepaceand introducing it into the.

'i .'kiln, substantially as described.

4. The combination of a kiln, a combustion-chamber at the rear of thekiln, a storage-s ace -in, the..combustion-chamber below ti mouth. ofthe kiln, a stack communicatin'g with' the combustion-chamber at oneside of the longitudinal'v line ofthe kiln, one

or more tubes in the Vupper portion of thel com'biistion-ch'amberextending across the path of. the V trom the ki n to thestack, saidtubes-discllliarping material into the storage-.spaceinl t e owerportion of the combustiorrchamp v ben-land means for'zr'ernovingvmaterial from the `storage-'space and deliveringit lto the kiln,substantially as described;v

' 5. The combination of a rotaryflkrin, a combustionfchamber at the rearof the kiln andhaving a stor'a e-space below the mouth ofthe kiln out o'the path of the prod ucts of combustion, a stack communicating .withthe' combustion-chamber,A .a bin,l a ,screw conveyer, a tube leading-from thel ,'screw conveyer'mto the combustion-chamber and across thepath of the products of combustion, a screw conveyer in the bottom of.the storage-space in the combustion-'chamber, av bucket elevator intowhich the lastmentionefil"vl screw conveyer feeds material,

and atube leading from the upper end of the elevator into the rotarykiln, substantially as described;

6. The combination of a rotary kiln, -a combustion-chamber at the-rearof the said kiln having a storage-space below the mouth of the rotarykiln and out'of the path of the products of combustion, a bini-for thematerial, a series of tubes leading frolmlthe bin into thecombustion-chamber to a point 'behr low the opening in the rotarykilnsothat the tubesare` heated by the products of'fco'msV of thestorage-space and delivering' -it intothe mouth of the rotaryvkiln,'substant ially n asdcscribed.

In testimony whereof I have :signed my name to this'specication in thepresencev of two subscribin lproducts of combustion passing 5 witnesses.

Witnesses '.1 i

' VERA THALEG,

GEO. A. CHRIST.

' bustionl in theirpassagetoathe stack, 'a'ccn-y i veyer for removingmaterial fromV the bottom 7o'-

